Ethernet source

Couple of things to do to elevate SQ of your Sonore ultrarendu,

1. Linear Power Supply, if you’re using a wall wart.
2. Clean Ethernet Feed
3. High Quality Ethernet LAN cable

Get rid of Netgear power line device, that is absolutely one of the worst thing ever invented. Get a Google Wi-Fi Mesh Network system,

https://www.amazon.com/Google-Wifi-System-Router-Replacement/dp/B08GG9CMLR/ref=sr_1_3?crid=2FA6TV6LV...

Plug one of these directly into your internet provider’s modem or gateway to create your Wi‑Fi network. Connect the ultrarendu into 2nd Google Wifi point.

The Ethernet port on your cable box is a ‘input’ port so you cannot use that to feed ultrarendu.

Use a high quality LAN cables like Supra CAT 8.
https://www.ebay.com/itm/Supra-CAT-8-ETHERNET-cable-1-meter-Made-In-Sweden-THE-BEST-FOR-NETWORK-AUDI...

Couple of big pluses of Google Wifi System, WiFi is much more robust than the basic modem provided by your Internet provider. Mine is AT&T and the WiFi coverage simply sucks. Secondly, you can prioritize the WiFI traffic to a device in Google WiFi app based on a usage.

“I could poke thru the wall and install an outlet fairly easily.”

@russellrcncom
That would be the most effective way to get ‘wired’ and noise free signal to your ultrarendu. I would steer clear of ‘audiophile’ network switch or hubs. The multiple LAN ports in these switches are prime source of noise. All of these network devices generate noise from the equipment itself along with noise from the AC adapter of the power supply.